System and Method for Provision of IMS Based Services for Legacy CS UE with Home Node B Access

Abstract

A system and method for providing user equipment (UE) mobility between a packet-switched system and a circuit-switched system is provided. In an embodiment, handover from a circuit-switched connection via a 3G Home Node B (3G HNB) to a circuit-switched connection via a Base Station System (BSS) is provided. In another embodiment, handover from a packet-switched connection via the 3G HNB to a circuit-switched connection via a BSS is provided. In yet another embodiment, handover from a packet-switched connection via a Long Term Evolution (LTE) access point to a circuit-switched connection via a 3G HNB is provided. Once handover is completed, an Interworking Function (IWF) is provided that acts as a Session Initiation Protocol (SIP) for translating circuit-switched signaling messages to SIP messages for packet-switched signaling. The bearer path comprises a circuit-switched bearer path to a Media Gateway (MGW), which provides a packet-switched bearer path toward the remote end.

Description

[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 098,152, filed on Sep. 18, 2008, entitled “System and Method for Provision of IMS Based Services for Legacy CS UE with Home Node B Access,” which application is hereby incorporated herein by reference.CROSS-REFERENCE TO RELATED APPLICATIONS[0002]This application relates to the following co-pending and commonly assigned patent applications: Ser. No. 12 / 486,645, filed Jun. 17, 2009, entitled “System and Method for Provision of IMS Based Services for Legacy CS UE with Home Node B Access,” Serial No. ______ (Attorney Docket No. HW 08FW132), filed Sep. 17, 2009, entitled “Attach and Handover for IMS Systems for Legacy CS UE with Home Node B Access,” Serial No. ______ (Attorney Docket No. HW 08FW137), filed Sep. 17, 2009, entitled “Attach and Handover for IMS Systems for Legacy CS UE with Home Node B Access,” and Serial No. ______ (Attorney Docket No. HW 08FW178), filed Sep. 17, 2009, entitled “Attach and Han...

AI Technical Summary

Benefits of technology

[0007]These and other problems are generally solved or circumvented, and technical advantages are generally achieved, by preferred embodiments of the present invention which provide for access to IP Multimedia Subsystem (IMS) sessions using a circuit-switched (CS) device.

Problems solved by technology

Legacy CS devices, however, are unable to communicate with the PS network, and hence, the legacy CS devices are unable to utilize services or take advantage of the capabilities offered by IMS systems or other PS networks.

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